Since our plan is to be able to use these with an 80Hz crossover, the cabinets will be ported. However, I do also plan on investigating a sealed version. Much depends on what SEAS is able to accomplish for us. Presently, not a single SEAS 4.5" Curv woofer exists, and while we are able to come fairly close to predicting the response by modeling, I really won't know for sure until the prototypes are here (which should be quite soon).